2 * Copyright 2011 Red Hat Inc.
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11 * The above copyright notice and this permission notice shall be included in
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26 #include <core/option.h>
27 #include <subdev/bios.h>
28 #include <subdev/bios/mxm.h>
29 #include <subdev/i2c.h>
32 mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
33 u8 offset, u8 size, u8 *data)
35 struct i2c_msg msgs[] = {
36 { .addr = addr, .flags = 0, .len = 1, .buf = &offset },
37 { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
40 return i2c_transfer(&bus->i2c, msgs, 2) == 2;
44 mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
46 struct nvkm_device *device = mxm->subdev.device;
47 struct nvkm_bios *bios = device->bios;
48 struct nvkm_i2c *i2c = device->i2c;
49 struct nvkm_i2c_bus *bus = NULL;
50 u8 i2cidx, mxms[6], addr, size;
52 i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
54 bus = nvkm_i2c_bus_find(i2c, i2cidx);
59 if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
61 if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
66 size = mxms_headerlen(mxm) + mxms_structlen(mxm);
67 mxm->mxms = kmalloc(size, GFP_KERNEL);
70 mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
78 #if defined(CONFIG_ACPI)
80 mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version)
82 struct nvkm_subdev *subdev = &mxm->subdev;
83 struct nvkm_device *device = subdev->device;
84 static char muid[] = {
85 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C,
86 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65
88 u32 mxms_args[] = { 0x00000000 };
89 union acpi_object argv4 = {
90 .buffer.type = ACPI_TYPE_BUFFER,
91 .buffer.length = sizeof(mxms_args),
92 .buffer.pointer = (char *)mxms_args,
94 union acpi_object *obj;
98 handle = ACPI_HANDLE(device->dev);
103 * spec says this can be zero to mean "highest revision", but
104 * of course there's at least one bios out there which fails
105 * unless you pass in exactly the version it supports..
107 rev = (version & 0xf0) << 4 | (version & 0x0f);
108 obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4);
110 nvkm_debug(subdev, "DSM MXMS failed\n");
114 if (obj->type == ACPI_TYPE_BUFFER) {
115 mxm->mxms = kmemdup(obj->buffer.pointer,
116 obj->buffer.length, GFP_KERNEL);
117 } else if (obj->type == ACPI_TYPE_INTEGER) {
118 nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n",
123 return mxm->mxms != NULL;
127 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
129 #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
132 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version)
134 struct nvkm_subdev *subdev = &mxm->subdev;
135 u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 };
136 struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args };
137 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
138 union acpi_object *obj;
141 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
142 if (ACPI_FAILURE(status)) {
143 nvkm_debug(subdev, "WMMX MXMI returned %d\n", status);
148 if (obj->type == ACPI_TYPE_INTEGER) {
149 version = obj->integer.value;
150 nvkm_debug(subdev, "WMMX MXMI version %d.%d\n",
151 (version >> 4), version & 0x0f);
154 nvkm_debug(subdev, "WMMX MXMI returned non-integer\n");
162 mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version)
164 struct nvkm_subdev *subdev = &mxm->subdev;
165 u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 };
166 struct acpi_buffer args = { sizeof(mxms_args), mxms_args };
167 struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
168 union acpi_object *obj;
171 if (!wmi_has_guid(WMI_WMMX_GUID)) {
172 nvkm_debug(subdev, "WMMX GUID not found\n");
176 mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00);
178 mxms_args[1] = wmi_wmmx_mxmi(mxm, version);
182 status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn);
183 if (ACPI_FAILURE(status)) {
184 nvkm_debug(subdev, "WMMX MXMS returned %d\n", status);
189 if (obj->type == ACPI_TYPE_BUFFER) {
190 mxm->mxms = kmemdup(obj->buffer.pointer,
191 obj->buffer.length, GFP_KERNEL);
195 return mxm->mxms != NULL;
199 static struct mxm_shadow_h {
201 bool (*exec)(struct nvkm_mxm *, u8 version);
203 { "ROM", mxm_shadow_rom },
204 #if defined(CONFIG_ACPI)
205 { "DSM", mxm_shadow_dsm },
207 #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE)
208 { "WMI", mxm_shadow_wmi },
214 mxm_shadow(struct nvkm_mxm *mxm, u8 version)
216 struct mxm_shadow_h *shadow = _mxm_shadow;
218 nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name);
219 if (shadow->exec(mxm, version)) {
225 } while ((++shadow)->name);
229 static const struct nvkm_subdev_func
234 nvkm_mxm_new_(struct nvkm_device *device, int index, struct nvkm_mxm **pmxm)
236 struct nvkm_bios *bios = device->bios;
237 struct nvkm_mxm *mxm;
241 if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL)))
244 nvkm_subdev_ctor(&nvkm_mxm, device, index, &mxm->subdev);
246 data = mxm_table(bios, &ver, &len);
247 if (!data || !(ver = nvbios_rd08(bios, data))) {
248 nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n");
252 nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f);
254 if (mxm_shadow(mxm, ver)) {
255 nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n");
257 /* we should, perhaps, fall back to some kind of limited
258 * mode here if the x86 vbios hasn't already done the
259 * work for us (so we prevent loading with completely
260 * whacked vbios tables).
268 nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n",
269 mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff);
270 mxms_foreach(mxm, 0, NULL, NULL);
272 if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true))
273 mxm->action |= MXM_SANITISE_DCB;